Microscopy Thread

[RobertK]

@revhtree HOW COOL IS THAT?!
I didn't know you guys were promoting threads in this way now?!

Wow, you're on the front page EnterName!

 

[mcarroll]

Pretty surprising they didn't do this much much sooner.

 

[revhtree Verified Admin]

We love good threads!!!

Thank you!

 

[EnterName]

All the weird things

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By now, this thread has accumulated quite a few posts showing specimens that were never properly identified. Here is a quick overview of them, along with a few that never made it into a post. Maybe someone recognizes one of them, or has at least seen them in their own tank:

(Post 224)

(No post - Egg?)

(No post - Egg?)

(Post 125 - Some kind of hydroid, but which one?)

(Post 39)

(Post 39)

(No post)

(No post, chrysophytes and some diatoms?)

(No post, chrysophytes among some diatoms?)

(Post 223)

(Post 149 - A ciliate, but which one?)

(Post 94 - Possibly some kind of fungus/mold)

(Post 218 - A dinoflagellate, but which one?)

(No post, another dinoflagellate?)
​

 

[RobertK]

Found this little critter in the water column, collected with a 25 micron sieve. Is it a rotifer? 400X.

 

[RobertK]

Here's another cool looking critter I found in the water column tonight. Also 400X.

 

[RobertK]

Then there was this thing, also seen here at 400X. About the same size as an ostreopsis dinoflagellate. No idea what it is, looks like something you'd see on a Grateful Dead t-shirt!

 

[EnterName]

@RobertK the first one should actually be a rotifer like you said. The last one looks like an oversized fungi spore. Really interesting...

 

[RobertK]

Found another rotifer, this one is different than the one I posted yesterday. I think this one is from genus Colurella (C. adriatica?) and the one from yesterday I think is genus Brachionus.

 

[Dan_P]

@revhtree HOW COOL IS THAT?!
I didn't know you guys were promoting threads in this way now?!

Well deserved recognition! What’s next, your own forum???

 

[EnterName]

@revhtree HOW COOL IS THAT?!
I didn't know you guys were promoting threads in this way now?!

Well deserved recognition! What’s next, your own forum???

Thank you Dan
Maybe in 10 to 20 years, once I've finally gathered some experience

I hope more people get into microscopy a little bit, not for diagnostic purposes, just for the fun of it, so we can compare and identify our findings together as a community. @RobertK, @christinna77, and a few others have already made some really cool contributions here and have added a lot of value to this thread.

I think there is a lot of potential. Diatoms, for example, are sometimes used to evaluate water quality. From playing around with nutrient levels in my tank, I can say that the ratio between cells of different genera changes visibly depending on those levels. Certain diatoms also seem to correlate with the appearance and disappearance of certain dinoflagellates in my tank, and their chloroplast density and shape sometimes changes as well. It would be great if other members could test this, too, as I don't think I will be able to set up conclusive experiments regarding this on my own.

 

[Dan_P]

Thank you Dan
Maybe in 10 to 20 years, once I've finally gathered some experience

I hope more people get into microscopy a little bit, not for diagnostic purposes, just for the fun of it, so we can compare and identify our findings together as a community. @RobertK, @christinna77, and a few others have already made some really cool contributions here and have added a lot of value to this thread.

I think there is a lot of potential. Diatoms, for example, are sometimes used to evaluate water quality. From playing around with nutrient levels in my tank, I can say that the ratio between cells of different genera changes visibly depending on those levels. Certain diatoms also seem to correlate with the appearance and disappearance of certain dinoflagellates in my tank, and their chloroplast density and shape sometimes changes as well. It would be great if other members could test this, too, as I don't think I will be able to set up conclusive experiments regarding this on my own.

I have observed the chloroplast change in diatoms in population that were declining. Not only that, but I observed microscopic “oil droplets”, the color of which was the same as the inside of the diatoms. To confirm that the oil droplets were diatom derived, I used a coverslip to smash the diatoms in a sample with no oil droplers and produced a massive amount. I have seen oil droplets in the past but never investigated them until now. I assume the appearance of these droplets correspond to dying diatoms.

 

[EnterName]

Thank you Dan
Maybe in 10 to 20 years, once I've finally gathered some experience

I hope more people get into microscopy a little bit, not for diagnostic purposes, just for the fun of it, so we can compare and identify our findings together as a community. @RobertK, @christinna77, and a few others have already made some really cool contributions here and have added a lot of value to this thread.

I think there is a lot of potential. Diatoms, for example, are sometimes used to evaluate water quality. From playing around with nutrient levels in my tank, I can say that the ratio between cells of different genera changes visibly depending on those levels. Certain diatoms also seem to correlate with the appearance and disappearance of certain dinoflagellates in my tank, and their chloroplast density and shape sometimes changes as well. It would be great if other members could test this, too, as I don't think I will be able to set up conclusive experiments regarding this on my own.

I have observed the chloroplast change in diatoms in population that were declining. Not only that, but I observed microscopic “oil droplets”, the color of which was the same as the inside of the diatoms. To confirm that the oil droplets were diatom derived, I used a coverslip to smash the diatoms in a sample with no oil droplers and produced a massive amount. I have seen oil droplets in the past but never investigated them until now. I assume the appearance of these droplets correspond to dying diatoms.

The chloroplast density seems to change as well as the color sometimes. But as I have never gotten below 300μg/L Si in my tank, I think I have never really seen a large scale diatom die-off just a transition between species. I will try squashing some diatoms later to see what you are talking about

Do you mean those "oil droplets"?

 

[Dan_P]

The chloroplast density seems to change as well as the color sometimes. But as I have never gotten below 300μg/L Si in my tank, I think I have never really seen a large scale diatom die-off just a transition between species. I will try squashing some diatoms later to see what you are talking about

Do you mean those "oil droplets"?

Yes, but even to the point of filling the entire cell. Outside the cells the oil droplets ranged in size, suggesting that they might be coalescing. My poor diatoms were clearly stressed :-)